Genelecs are notoriously hard to mix on. They take a long time to learn. Probably the hardest speaker to work with out of the box. I know someone who earns 6-7 figures annually mixing some of the biggest acts around. The only speakers on his console are NS10s. The reason being is that they are the best tool for the job. They have a flat and clear response which is what you want when mixing. On the other hand I have heard enough mixes coming out of Genelec equipped studios that sounded amazing in the studio and like garbage anywhere else. I've also heard great mixes on Genelecs but only from engineers who have used them in the same room for a few years.